#include <stdio.h>

int main()
{
   int a[4]={2016,2017,2018,2019};
   int *ptr1 = (int *)(&a + 1);
   int *ptr2 = (int *)((long)a + 1);
   // printf("%x %x\n", ptr1[-1], *ptr2);
   printf ("%p %p\n",a,ptr2);
   // ptr[-1] = *(ptr-1)
   return 0;

}




